package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.result.PageResult;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    private static final String GRANT_TYPE = "authorization_code";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登录
     * @param userLoginDTO 微信登录的数据模型
     * @return UserLoginVO 用户登录VO
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前微信用户的openid
        String openid = getOpenId(userLoginDTO.getCode());
        // 判断当前openid是否为空表示登录失败，抛出业务异常
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        // 判断当前用户是否为新用户
        User user = userMapper.getByopenid(openid);
        // 如果是新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        // 返回用户对象
        return user;
    }
    private String getOpenId(String code){
        Map<String,String> paramMap = new HashMap<>();
        paramMap.put("appid", weChatProperties.getAppid());
        paramMap.put("secret",weChatProperties.getSecret());
        paramMap.put("js_code",code);
        paramMap.put("grant_type",GRANT_TYPE);
        // 发起微信接口调用，接收返回结果Result
        String ResultJson = HttpClientUtil.doGet(WX_LOGIN_URL, paramMap);
        // 将ResultJson字符串转换为JSON对象
        JSONObject parseObject = JSON.parseObject(ResultJson);
        // 获取openid
        String openid = parseObject.getString("openid");
        return openid;
    }
}
